Actually, IIRC, for quite a while, 5.9.x *had* err, and it was culled not to long before 5.10 came out due to some backwards compatability issues noone seemed to be able to resolve.

In reply to Re^4: RFC: Defined-Or for before Perl 5.10 by JavaFan
in thread RFC: Defined-Or for before Perl 5.10 by molecules

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